BackgroundThe International Commission of Radiology recommends a pregnancy screening test to
all female patients of childbearing age who will undergo a radiological study.
Radiation is known to be teratogenic and its effect is cumulative. The teratogenic
potential starts at doses close to those used during these procedures. The
prevalence of positive pregnancy tests in patients undergoing electrophysiological
studies and/or catheter ablation in our midst is unknown. ObjectiveTo evaluate the prevalence of positive pregnancy tests in female patients referred
for electrophysiological study and/or radiofrequency ablation. MethodsCross-sectional study analyzing 2,966 patients undergoing electrophysiological
study and/or catheter ablation, from June 1997 to February 2013, in the Institute
of Cardiology of Rio Grande do Sul. A total of 1490 procedures were performed in
women, of whom 769 were of childbearing age. All patients were screened with a
pregnancy test on the day before the procedure. ResultsThree patients tested positive, and were therefore unable to undergo the
procedure. The prevalence observed was 3.9 cases per 1,000 women of childbearing
age. ConclusionBecause of their safety and low cost, pregnancy screening tests are indicated for
all women of childbearing age undergoing radiological studies, since the degree of
ionizing radiation needed for these procedures is very close to the threshold for
teratogenicity, especially in the first trimester, when the signs of pregnancy are
not evident.